this could do the trick ...
http://www.trusteli.com/consumer/index.html
i have not had a chance to test it out, so if you do, i'd be curious what you think.
currently, i use the software from Astaro...
www.astaro.com
free to download...plus an anuual subscription fee. you'll need an old pc to run it on.
Content filtering (for both the astaro software and the eli router) is dynamic based on a database of sites, instead of just url filtering. Not sure about the eli device, but astaro software also scans images (jpg, bmp etc) and can block xxx content based on just the image itself.